The nutrition information could be useful but how they implement it is critical.
For example, if I am allergic to something, I'd want to be positively alerted that the product contains the allergens that affect me, or those I am buying for.
If I were a vegetarian, a vegan, a follower of some religions, I'd want to be alerted if there are any "forbidden" ingredients.
There are things some people hate - like cilantro/coriander (which I like) and caraway (which I detest) - and I want to be alerted if it contains the ones I've said I hate!
I want it to work whether or not there I have a connection. In many shops, there simply is no connection available.
I do not want to be told, ad nauseam, the "good" and "bad" cholesterol content of the item.
I want it to work in all markets, not somehow be USA-only.
I want it to understand labels in multiple languages. While the UK has formal requirements for labels to be in English, I want to be able to use this wherever I am, wherever the food came from.